Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216...99e&link_type=abstract
Tectonophysics, Vol. 216, No. 1/2, p. 99 - 109
Physics
7
Scientific paper
A circular negative Bouguer anomaly is associated with the Lappajärvi impact structure. There are irregularities in the anomaly pattern due to differentially faulted bedrock blocks and lateral density contrasts between bedrock, shocked bedrock, breccia, suevite, impact melt rock and overburden. There are a few small aeromagnetic anomalies within the crater, which is mostly characterized by a lack of magnetized material. Strong magnetic anomalies which are abundant in the surroundings disappear in the crater area. The aero-electromagnetic (AEM) data show strong anomalies with inphase/quadrature ratios close to 1. An electromagnetic wide-band profile was measured across the annular depression between the centre and the rim of the crater. Three layers were interpreted. The results of geophysical interpretations, such as the annular depression between the centre and the rim of the crater, the small thickness/diameter ratio of the geophysically anomalous part of the crater, and the calculated amount of impact melt rock, indicate that the Lappajärvi structure belongs to the category of complex craters.
Elo S.
Jokinen T.
Soininen H.
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